Corner system



FIG. 1 is a perspective view of a corner system, shown attached to a box environment;

FIG. 2 is a left side perspective view of the corner system of FIG. 1, the right side perspective view of which is a mirror image thereof;

FIG. 3 is an end view of the corner system of FIG. 1; and,

FIG. 4 is a front view of the corner system of FIG. 1.

The broken lines shown in the drawings represent unclaimed portions of the corner system and form no part of the claimed design. 

The ornamental design for a corner system, as shown and described. 